While trying to better track my health I have bought into a few Withings products. It started with the desire to get a smart scale that could integrate with Home Assistant. This desicion was made before they started having Bluetooth as a main way of integrating, so the Withings Body+ seemed like an ok compromise (settling for a cloud polling integration).
While the weight tracking works exactly as expected once a developer account was created and port 443 was forwarded to 8123 to allow Withings to validate the connect, I did have to manually add a sensor in configuration.yaml to convert the metric weights to pounds.
This sensor proved very valuable as an added conditions to a few of my motion sensors as my puppy dog started triggering some of my lighting/morning routine automations were being triggered by him when he was allowed out of his crate overnight a few times.
The only disappointing thing I have run into with Withings is the lack of smart watch data being imported. I don't know what I would do with my step count, but I am sure I could come up with some interesting notifications for motivation/reminders to get my steps in for the day.